Air drafting arrangement



Sept 5, 1966 R. M. INGHAM, JR., ETAL 3,270,397

AIR DRAFTING ARRANGEMENT 2 Sheets-Sheet 1 Original Filed Aug. 14, 1963 INVENTORS ROBERT M INGHAM,JR NORMAN E.KLEIN By RICHARD V.PUTNAM ATTORNEY p 6, 1966 R. M. INGHAM, JR., ETAL 3,270,397

AIR DRAFTING ARRANGEMENT 2 Sheets-$heet Original Filed Aug. 14, 1963 IN VEN TORS ROBERT M.INGHAM,JR. NORMAN E.KLEIN By RICHARD V.PUTNAM ATTO RNEY United States Patent 3,270,397 AIR DRAFTING ARRANGEMENT Robert M. Ingham, Jr., Norman E. Klein, and Richard V.

Putnam, Spartanburg, S.C., assignors to Deering Milliken Research Corporation, Spartanburg, SC, a corporation of Delaware Original application Aug. 14, 1963, Ser. No. 302,211.

Divided and this application Oct. 23, 1964, Ser.

2 Claims. (U. 29-121) This application is a division of SN. 302,211, filed August 14, 1963.

This invention relates generally to textile fiber handling apparatus and more particularly to fiber drafting systems which serve to exert a compacting action on a mass of staple fiber preparatory to forming the fibers into a yarn or the like.

The employment of perforated drafting rolls systems to exert compacting forces, on a mass of fibers generally is known in the art as exemplified in US. Patent 3,090,081, N. E. Klein, May 21, 1963. Such systems employ a vac uum source within the center of a lower perforated drafting roll. Necessarily, some type of suction nozzle has to be provided to connect the desired portion of the drafting roll to the vacuum source. These nozzles have to be properly aligned or they will restrict the rotation of the roll if they are too close or will not provide sufficient vacuum to the roll if the clearance between the internal diameter of the roll and the vacuum nozzle is too large. Further, because the internal vacuum system is introduced into one end or the other of the drafting roll it is only possible to employ two rolls on a common mounting Also, because of the close tolerance of the suction nozzle to the internal diameter of the drafting roll, plugging and jamming of the suction nozzle becomes a problem result ing in a high percentage of yarn breakage due to the sucking of the fibers being compressed into the drafting roll and being caught by the accumulated fibers between the suction nozzle and the rotating drafting roll causing the fibers to be retained momentarily, thus breaking the fiber being treated. Still further, fiber handling systems of the type shown in US. Patent 3,090,081, supra, are not readily adaptive to existing drafting systems because of the limitation of having the perforated rolls in pairs only. Existing systems employ six or more drafting rolls in line and thus are not readily converted to the drafting system: shown in the prior art.

It is, therefore, an object of the invention to provide a fiber handling system which is simple in construction, more efficient, and readily adaptable to existing systems.

Another object of the invention is to provide a fiber handling system which readily compacts the fibers being handled without the employment of complicated drafting equipment.

A third object of the invention is to provide a fiber handling system which can efiiciently compact fiber on a multiplicity of manifolded drafting systems and which is readily adaptable to existing systems.

A still further object of the invention is to provide a fiber handling system which employs perforated drafting rolls to exert a compressing action on the fibers being handled through the use of a vacuum system that pulls the air through the perforated rolls.

A fifth object of the invention is to provide a perforated drafting roll fiber handling system which efficiently compacts the fibers being handled by the use of a suction system to pull air completely through the roll to compact the fibers and reduce the effect of windage.

A still further object of the invention is to provide a perforated drafting roll fiber handling system in which the perforated drafting rolls employed are self-cleaning and do not require numerous shut downs for the purpose of lint removal.

Other objects and advantage-s of this invention will be readily apparent as the specification proceeds to describe the invention with reference to the accompanying drawing in which:

FIGURE 1 is a schematic view in perspective of a drafting arrangement according to the preferred form of the invention;

FIGURE 2 is a schematic elevation view of the construction shown in FIGURE 1 looking at one end of the drafting rolls;

FIGURE 3 is an enlarged, partially cut-away view of the lower front drafting roll shown in FIGURES 1 and 2;

FIGURE 4 is a schematic view of the preferred manifolded operation of the invention;

FIGURE 5 shows a modification of the drafting roll shown in FIGURES l-4; and

FIGURE 6 is a modification of the slot design shown in detail in FIGURE 3.

Referring now to the figures of the drawings, in the illustrative example a linear mass of staple fibers in the form of roving 10 is fed from a supply source (not shown) through a traversing guide trumpet 12 to a drafting arrangement, generally designated as 14. The drafting arrangement is schematically illustrated for purposes of simplicity of explanation and it will be understood by those skilled in the art that conventional refinements may be added thereto, if desired.

In the illustrated drafting arrangement 14 as shown, three sets of drafting rolls are provided, namely back rolls 16 and 18; middle rolls 20 and 22, and front rolls 24 and 26. As in conventional practice, at least one of each of these sets of rolls is driven, and each succeeding set of rolls is as usual driven at a faster rate than the preceding rolls in order to give the desired degree of drafting of the fibers in the zones between the respective pair of rolls. As is well known in the art, drafting aprons 28 and 30 are employed in conjunction with middle rolls 20 and 22, respectively, to control the flow of fibers to the front rolls 24 and 26. The fiber mass is twisted as it leaves the nip N of the front pair of rolls 24 and 26 by the twisting action of a twisting and take-up device, which in this illustrative embodiment takes the form of a conventional ring and traveler twister take-up 32 onto which the drafted and twisted fiber mass is then taken up as yarn Y.

In a drafting arrangement incorporating the present invention, at least one, and preferably the lower front one 26 of the drafting rolls is formed in a novel manner and serves to aid in imparting a unique and highly advantageous lateral pneumatic compacting action on the fiber mass.

Looking now to FIGURES l-4, one form of the invention is shown in detail. Lower rolls 26 are formed as an integral part of the drive shaft 34. An annular groove 36 is cut or milled into shaft 34 and a perforated collar member 38 is telescoped over the annular groove 36 and secured to the shaft 34 by any suitable means such as shrink-fitting to provide a lower drafting roll. An annular series of holes 40 are drilled in the center of milled notches 42 in the collar 38 to provide communication with the annular groove 36.

A suction conduit manifold 43 connected to a source of negative pressure (not shown) is supported in any suitable manner under the lower front roll 26. Suction conduit riser 44, of any suitable material connected to the suction manifold 43 provides communication between the groove 36 and the suction manifold through an aperture 45 in the suction conduit and holes 40 in the collar 38.

Side Walls 46 and 48 of the suction conduit riser 44 abut the collar member 38 on opposite sides of the notches 42 and provide radial bearing surfaces for the rotating collar and also tend to provide a sealing surface so that the full effect of the suction source will act through the holes 40 to pull the required quantity of ambient air through the perforated collar member 38. A chamfer 50 is provided on the top edge of the front wall 52 of the riser 44 to collect any ambient lint or fiy and to catch the end of the fiber if the yarn should break between the front rolls 24 and 26 and the ring and traveler device 32. Chamfer 50 in conjunction with the vacuum source will continue to take away any fiber forwarded from the front rolls until such time that the break in the fiber is repaired.

Looking now at FIGURE 4 the suction manifold 43 is shown in operative relationship with a plurality of lower front rolls 26. The number of such rolls in operative relationship with the suction manifold 43 is optional and does not constitute a part of the invention. Conduit 54 is connected to the source of negative pressure (not shown).

Preferably "both the trumpet member 12 and the lower front rolls 26 are traversed to evenly distribute the wear on the front and back rolls. schematically shown, the trumpet bar 56 and the shaft 34 are connected together by a cross bar 58 which is reciprocally driven by an eccentric crank arrangement 60. The particular traversing arrangement is only schematic and does not form part of the invention since any suitable traversing mechanism can be substituted. The extent of traverse and the rate of traverse is within the judgment of one skilled in the art except that it is preferred that the front roll traverse be so limited that the notches 42 remain within the confines of the walls 46 and 48 of the suction conduit takeoffs 44.

In the operation of the illustrative embodiment of FIGURES 1 4 the linear mass of staple fibers is passed through the forming trumpet 12 and drafting assembly 14 to the ring and traveler twister take-up 32. The perforated roll 26 exerts a sucking action on the mass of fibers in the zone immediately preceding, including, and subsequent to the nip N. This sucking action is effective to exert compacting forces on the fiber mass transverse to its direction of travel, thereby tending to compact the fiber mass against the roll surface and to hold the fiber mass on the roll surface in the zone of the holes 40. The perforated roll 26 is also traveling at a peripheral rate in excess of the mass of fibers 10 approaching this roll from the middle pair of rolls and 22 and accordingly there is linear motion between the perforated roll surface and the fibers lying on the surface of the perforated roll 26 in the zone preceding the nip N. In the zone, the roll 26 is traveling faster than a substantial number of the fibers therein and substantial drafting takes place in this zone.

In addition to the better compacting of the fiber mass by the sucking action exerted on the fibers by the perforated roll 26, this sucking immediately preceding the nip N tends to effect a straightening of the fibers, particularly a straightening of the leading books which normally occur in various masses of staple fibers, including carded sliver, roving, etc. This is a unique and important function of this invention, particularly as applied in a drafting arrangement for the straightening of such leading hooks on the fibers is of considerable importance in the forming of high quality yarn.

The drafted and straightened fibers in the compacted mass are then nipped in sequence in respect to their respective ordered linear position in the fiber group as such fibers successively approach and reach the nip N. The mass of fibers leaving the nip N is twisted by the twisting action of the ring and traveler take-up 32 and proceeds in the form of yarn Y or other desired strandular material to the take-up bobbin B. While a twister take-up is disclosed for illustrative purposes, it will be apparent that a non-twist imparting take-up may be employed, if desired, for the formation and handling of a particular other mass product or intermediate product.

FIGURE 5 shows a modified lower front roll in the form of a perforated collar member 380. Perforated collar member 380 is similar to collar member 33 except the groove 360 is cut or milled in the collar member 380 rather than in the shaft 34 as shown in FIGURES 1-4.

FIGURE 6 shows a further modification which can be applied to either the preferred embodiment of FIGURES 14 or to the modification of FIGURE 5. In FIGURE 6 the elongated notches 420 are hobbed into the perforated collar member rather than being milled. Other ways of forming the notch can be employed, if desired, since the particular way of forming the notch is not within the scope of the invention.

The herein disclosed improved drafting system has many advantages over that previously employed. As an example, the suction action in the vicinity of the nip N tends to reduce the amount of fly formed as a result of the normally substantial drafting action which takes place between the middle and front pairs of rolls. Also, as an important result of the partial vacuum that exists in the approach areas to the nip N of the rolls, the fibers approaching the nip N do not tend to spread out laterally as they approach the nip as they do in conventional drafting arrangements at high speeds due to the normal positive pressure air pocket and consequent laterally outward air movement in the nip approach zone. On the contrary, the partial vacuum in the approach area to the nip N enables the fibers to come into and maintain closer lateral relationship under the compacting action exerted thereon by the air stream entering the slots 42 and 420.

Another advantage of the herein disclose-d invention is that the smooth unmachined area between the slots in the collar members in cooperation with the slots provide a gear type surface which physically grabs the fibers, cornpacts them due to the suction effect and releases them after they are supplied to the nip N.

Further, our new and improved suction drafting arrangement is not prone to clog with fibers like a system such as shown in US. Patent 3,090,081, supra. It is obvious, since the suction source is below the perforated lower roll, that any fibers which are pulled into the roll through the apertures which are exposed to the ambient air pressure will be automatically pulled out of the roll when that portion of the roll rotates to a position when the inner surface of the roll is in direct communication with the suction source thereby pulling such collected fibers from within the interior of the roll through the particular apertures and directed to waste through the suction system. Furthermore, our new and improved suction manifold arrangement not only provides a system which can be readily adapted to existing systems employing a multiplicity of rolls on one machine but also provides suction take-oifs which perform the triple function of providing suction pressure to the perforated roll, provides a close seal, and acts as a radial bearing for support of the drafting roll and drive shaft.

Although we have described in detail the preferred embodiments of our invention we contemplate that many changes may be made without departing from the scope or spirit of our invention, and we desire to be limited only by the claims.

That which is claimed is:

1. A drafting roll for a drafting system comprising: an elongated one-piece solid shaft member, a plurality of narrow annular grooves formed in said shaft member, a one-piece collar member telescoped over each of said narrow annular grooves, said collar members having an internal diameter substantially equal to the external diameter of said shaft member, a plurality of notches in the periphery of each of said collar members and an aperture in each of said notches providing communication with said annular groove.

2. The structure of claim 1 wherein the centerline of said notches is substantially parallel to the axis of said shaft member.

References Cited by the Examiner UNITED STATES PATENTS 1,474,346 11/1923 Campbell 291 19 2,753,181 7/ 1956 Anander 29-121 2,871,502 2/1959 Whisnant 15306.1 3,090,081 5/1963 Klein 19-288 FOREIGN PATENTS 559,388 2/1944 Great Britain. 570,795 7/ 1945 Great Britain.

15 WALTER A. SCHEEL, Primary Examiner.

BILLY I. WILHITE, Examiner. 

1. A DRAFTING ROLL FOR A DRAFTING SYSTEM COMPRISING: AN ELONGATED ONE-PIECE SOLID SHAFT MEMBER, A PLURALITY OF NARROW ANNULAR GROOVES FORMED IN SAID SHAFT MEMBER, A ONE-PIECE COLLAR MEMBER TELESCOPED OVER EACH OF SAID NARROW ANNULAR GROOVES, SAID COLLAR MEMBERS HAVING AN INTERNAL DIAMETER SUBSTANTIALLY EQUAL TO THE EXTERNAL DIAMETER OF SAID SHAFT MEMBER, A PLURALITY OF NOTCHES IN THE PERIPHERY OF EACH OF SAID COLLAR MEMBERS AND AN APERTURE IN EACH OF SAID NOTCHES PROVIDING COMMUNICATION WITH SAID ANNULAR GROOVE. 